linux compatibility module build problems..

Hi.

My sources are updated to HEAD.
When I try to do: *cd /usr/src/sys/modules/linux && make*

cc -c -O2 -fno-strict-aliasing -pipe -march=prescott -Werror -D_KERNEL 
-DKLD_MODULE -std=c99 -nostdinc -I. -I_at_ -I_at_/contrib/altq 
-finline-limit=8000 --param inline-unit-growth=100 --param 
large-function-growth=1000 -mno-align-long-strings 
-mpreferred-stack-boundary=2 -mno-mmx -mno-3dnow -mno-sse -mno-sse2 
-mno-sse3 -ffreestanding -fstack-protector -fstack-protector -Wall 
-Wredundant-decls -Wnested-externs -Wstrict-prototypes 
-Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual -Wundef 
-Wno-pointer-sign -fformat-extensions  _at_/i386/i386/genassym.c
_at_/i386/i386/genassym.c:40:29: error: opt_hwpmc_hooks.h: No such file or 
directory
*** Error code 1

Stop in /usr/src/sys/modules/linux.
Exit 1

Where is the problem ? My sources are updated via csup..
Should I download that file manually ??

Best regards,

Martin Baumann